From the text on the back, it seems like your trade card for Thompson, Sons & Co. possibly dates from the first decade of the 1900's.
The first hint would be the phrase "after an auto ride"...the automobile industry in the US began in the 1890's, and became more widespread a decade later.
The second hint would be where the text states that Thompson's Celebrated Eye Water has been before the public for over a century...a quick Google search shows that Dr. Thompson introduced the remedy in 1795.
I've got no idea on it's value, but it sure does have a neat image!
Hope this helps!
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